Everything you can build,
on the mailbox your team already reads.

Send one message or a hundred per call, now or later, and retry without sending twice.

A body written once, versioned, and sent many times: from the composer, from your own code, or by an agent.

Pick them with the paperclip or paste them in. A pasted image lands in the body rather than the file list, and a file dragged onto the composer is not attached at all. On an OpenEmail mailbox incoming files sit in object storage, one object each, and opening a thread pulls every one of them.

Write it now, land it when they are awake.

A window to change your mind, and the composer comes back exactly as it was.

Tell your endpoint when mail arrives, instead of making you poll.

Whether a message you sent has been opened, when, how many times and which of its links were followed. Off until you turn it on, and plain about the readings it cannot get.

Your own conditions, and what should happen to anything that matches them.

A documented HTTP API with issuable, scopable, revocable keys.

A TypeScript client first, then the rest.

Your mailbox and every API operation, from a terminal or a script.

Point Claude, or any MCP client, at your mailbox.

A key per job, limited to the scopes and senders it needs, with every call logged.

Apps register themselves and sign in with PKCE, and you choose the workspace, addresses and permissions each one gets.

Forgiving words and operators like from: and has:, inside the folder you are reading.

Name a label, pick a colour, and filter the list down to it.

Autosaved three seconds after you stop typing, and reopened from the Drafts folder with the recipients, the subject, the body and the From address intact. The attachments stay behind.

The people you already write to, offered as you type.

Keep a private note attached to a thread.

Every attachment this mailbox holds, in one place you can search, download and clear out.

Bring your suppressions, audiences, contacts, templates and webhooks across with one key, with a checklist for your domains and API keys.